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Jun 28, 2018
06/18

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Marco Sabatini

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We extend a result proved in \cite{Col} for mirror symmetries of planar systems to measure-preserving non-linear reversibilities of $n$-dimensional systems, dropping the analyticity and nondegeneracy conditions.

Topics: Dynamical Systems, Mathematics

Source: http://arxiv.org/abs/1510.01464

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2.0

Jun 26, 2018
06/18

by
Marco Sabatini

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We give a sufficient condition for systems with symmetries to have periodic solutions with equal periods. We show that the main result can be applied both to Hamiltonian and to non-Hamiltonian systems. We apply the main results to produce planar centers with equal period functions.

Topics: Classical Analysis and ODEs, Mathematics, Dynamical Systems

Source: http://arxiv.org/abs/1501.07122

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2.0

Jun 27, 2018
06/18

by
Marco Sabatini

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We prove that for every planar differential system with a period annulus there exists an involution $\sigma$ such that the system is $\sigma$-symmetric. We also prove that for for every planar differential system with a period annulus there exist infinitely many involutions $\sigma$ such that the system is $\sigma$-reversible.

Topics: Mathematics, Classical Analysis and ODEs, Dynamical Systems

Source: http://arxiv.org/abs/1504.04530

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2.0

Jun 28, 2018
06/18

by
Fabio Sabatini; Francesco Sarracino

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Online social networks such as Facebook disclose an unprecedented volume of personal information amplifying the occasions for social comparisons. We test the hypothesis that the use of social networking sites (SNS) increases people's dissatisfaction with their income. After addressing endogeneity issues, our results suggest that SNS users have a higher probability to compare their achievements with those of others. This effect seems stronger than the one exerted by TV watching, it is...

Topics: Social and Information Networks, Physics and Society, Quantitative Finance, Physics, Computers and...

Source: http://arxiv.org/abs/1507.08863

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Jun 27, 2018
06/18

by
Milena Pabiniak; Silvia Sabatini

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Let $M$ be a symplectic toric manifold acted on by a torus $\mathbb{T}$. In this work we exhibit an explicit basis for the equivariant K-theory ring $\mathcal{K}_{\mathbb{T}}(M)$ which is canonically associated to a generic component of the moment map. We provide a combinatorial algorithm for computing the restrictions of the elements of this basis to the fixed point set; these, in turn, determine the ring structure of $\mathcal{K}_{\mathbb{T}}(M)$. The construction is based on the notion of...

Topics: Symplectic Geometry, Mathematics

Source: http://arxiv.org/abs/1503.04730

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Jun 27, 2018
06/18

by
Giovanni Pizzi; Andrea Cepellotti; Riccardo Sabatini; Nicola Marzari; Boris Kozinsky

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Computational science has seen in the last decades a spectacular rise in the scope, breadth, and depth of its efforts. Notwithstanding this prevalence and impact, it is often still performed using the renaissance model of individual artisans gathered in a workshop, under the guidance of an established practitioner. Great benefits could follow instead from adopting concepts and tools coming from computer science to manage, preserve, and share these computational efforts. We illustrate here our...

Topics: Software Engineering, Condensed Matter, Materials Science, Computational Physics, Computing...

Source: http://arxiv.org/abs/1504.01163

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Jun 26, 2018
06/18

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S. Corbel; J. C. A. Miller-Jones; R. P. Fender; E. Gallo; T. J. Maccarone; T. J. O'Brien; Z. Paragi; M. P. Rupen; A. P. Rushton; S. Sabatini; G. R. Sivakoff; J. Strader; P. A. Woudt

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The universal link between the processes of accretion and ejection leads to the formation of jets and outflows around accreting compact objects. Incoherent synchrotron emission from these outflows can be observed from a wide range of accreting binaries, including black holes, neutron stars, and white dwarfs. Monitoring the evolution of the radio emission during their sporadic outbursts provides important insights into the launching of jets, and, when coupled with the behaviour of the source at...

Topics: High Energy Astrophysical Phenomena, Astrophysics

Source: http://arxiv.org/abs/1501.04716

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Jun 28, 2018
06/18

by
A. Rappoldi; F. Lucarelli; C. Pittori; F. Longo; P. W. Cattaneo; F. Verrecchia; M. Tavani; A. Bulgarelli; A. W. Chen; S. Colafrancesco; I. Donnarumma; A. Giuliani; A. Morselli; S. Sabatini; S. Vercellone

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Context. Known TeV sources detected by major Cerenkov telescopes are investigated to identify possible MeV-GeV gamma-ray counterparts. Aims. A systematic study of the known sources in the web-based TeVCat Catalog has been performed to search for possible gamma-ray counterpart on the AGILE data collected during the first period of operations in observing pointing mode. Methods. For each TeV source, a search for a possible gamma-ray counterpart based on a multi-source Maximum Likelihood algorithm...

Topics: Astrophysics, High Energy Astrophysical Phenomena

Source: http://arxiv.org/abs/1512.00301

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Jun 28, 2018
06/18

by
S. Sabatini; I. Donnarumma; M. Tavani; A. Trois; A. Bulgarelli; A. Argan; G. Barbiellini; P. W. Cattaneo; A. Chen; E. Del Monte; V. Fioretti; F. Gianotti; A. Giuliani; F. Longo; F. Lucarelli; A. Morselli; C. Pittori; F. Verrecchia; P. Caraveo

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We present a study of the Angular Resolution of the AGILE gamma-ray imaging detector (GRID) that is operational in space since April 2007. The AGILE instrument is made of an array of 12 planes each equipped with a Tungsten converter and Silicon micros trip detectors and is sensitive in the energy range 50 MeV - 10 GeV. Among the space instruments devoted to gamma-ray astrophysics, AGILE uniquely exploits an analog readout system with dedicated electronics coupled with Silicon detectors. We show...

Topics: High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics, Astrophysics

Source: http://arxiv.org/abs/1507.01475

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Jun 26, 2018
06/18

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P. Cumani; A. M. Galper; V. Bonvicini; N. P. Topchiev; O. Adriani; R. L. Aptekar; A. Argan; I. V. Arkhangelskaja; A. I. Arkhangelskiy; L. Bergstrom; E. Berti; G. Bigongiari; S. G. Bobkov; M. Boezio; E. A. Bogomolov; S. Bonechi; M. Bongi; S. Bottai; A. Bulgarelli; G. Castellini; P. W. Cattaneo; G. L. Dedenko; C. De Donato; V. A. Dogiel; I. Donnarumma; V. Fioretti; M. S. Gorbunov; Yu. V. Gusakov; B. I. Hnatyk; V. V. Kadilin; V. A. Kaplin; A. A. Kaplun; M. D. Kheymits; V. E. Korepanov; J. Larsson; A. A. Leonov; V. A. Loginov; F. Longo; P. Maestro; P. S. Marrocchesi; A. L. Menshenin; V. V. Mikhailov; E. Mocchiutti; A. A. Moiseev; N. Mori; I. V. Moskalenko; P. Yu. Naumov; F. Palma; P. Papini; M. Pearce; G. Piano; P. Picozza; A. V. Popov; A. Rappoldi; S. Ricciarini; M. F. Runtso; F. Ryde; S. Sabatini; R. Sarkar; O. V. Serdin; R. Sparvoli; P. Spillantini; S. I. Suchkov; M. Tavani; A. A. Taraskin; M. Tavani; A. Tiberio; E. M. Tyurin; M. V. Ulanov; A. Vacchi; E. Vannuccini; G. I. Vasilyev; V. Vittorini; Yu. T. Yurkin; N. Zampa; V. N. Zirakashvili; V. G. Zverev

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GAMMA-400 is a new space mission, designed as a dual experiment, capable to study both high energy gamma rays (from $\sim$100 MeV to few TeV) and cosmic rays (electrons up to 20 TeV and nuclei up to $\sim$10$^{15}$ eV). The full simulation framework of GAMMA-400 is based on the Geant4 toolkit. The details of the gamma-ray reconstruction pipeline in the pre-shower and calorimeter will be outlined. The performance of GAMMA-400 (PSF, effective area) have been obtained using this framework. The...

Topics: Instrumentation and Methods for Astrophysics, High Energy Astrophysical Phenomena, Astrophysics

Source: http://arxiv.org/abs/1502.03287